Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21baf74ca5222a2c00dc7e0715143914be473553f8ff38ce1392328e09952a4' 
  AND token = 'WTM7qQsfNp9MPy0ia7iuBlFeEcUonSGvD4tKS/dErEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}